fix: chat input clipping, AI appointments create patients, batched approval

1. Chat input toolbar was clipped in the empty state: the form's overflow-hidden
   made its flex min-height resolve to 0, so the vertically-centered layout
   squeezed it and hid the bottom toolbar (attach/add-patient/model/mic/send).
   Add `shrink-0` to the form; let the empty-state column scroll.
2. AI-imported appointments now create/link a patient: services.ensurePatient
   reuses a same-name patient or creates one (auto file number, source "ai");
   appointments.createAppointment calls it when the booking has no file number,
   so imported people appear on the Patients page.
3. Many proposals collapse into one BatchActionPreviewCard → a review dialog
   with per-row remove and "Add all" (commits sequentially), instead of one
   Add/Discard card per record.

Plus: widen the Live chart right margin so the value pill stays inside the card.
Verified with `next build`.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/components/analysis/live-hospital-chart.tsx

@@ -86,7 +86,7 @@ export function LiveHospitalChart() {
         <div className="h-56 w-full">
           <LiveLineChart
             data={data}
-            margin={{ left: 44 }}
+            margin={{ left: 44, right: 28 }}
             value={value}
             window={WINDOW_SECONDS}
           >